won't stop running till we reach the sun

So, there's this group of girls in my first period Chem Class that always talk in the hallway and are 5 minutes late to class. I put my stuff in the classroom and went to the bathroom, and when I came back, the door was LOCKED D: The teacher didn't let us in the whole class and taught us new material which there's a quiz on tomorrow??? And I wasn't even late to class but eh didn't care???